diff --git a/arbitrile.cpp b/arbitrile.cpp
index 16427b4d..fe6fb569 100644
--- a/arbitrile.cpp
+++ b/arbitrile.cpp
@@ -16,6 +16,7 @@ EX namespace arb {
 
 struct shape {
   int id;
+  int flags;
   vector<hyperpoint> vertices;
   vector<ld> angles;
   vector<ld> edges;
@@ -27,6 +28,7 @@ struct shape {
 struct arbi_tiling {
 
   int order;
+  bool have_line, have_ph;
 
   vector<shape> shapes;
   string name;
@@ -85,6 +87,14 @@ void load(const string& fname) {
   exp_parser ep;
   ep.s = s;
   ld angleunit = 1, distunit = 1, angleofs = 0;
+  auto addflag = [&] (int f) {
+    int ai;
+    if(ep.next() == ')') ai = isize(c.shapes)-1;
+    else ai = ep.iparse();
+    verify_index(ai, c.shapes); 
+    c.shapes[ai].flags |= f;
+    ep.force_eat(")");
+    };
   while(true) {
     ep.skip_white();
     if(ep.next() == 0) break;
@@ -116,6 +126,14 @@ void load(const string& fname) {
     else if(ep.eat("angleunit(")) angleunit = real(ep.parsepar());
     else if(ep.eat("angleofs(")) angleofs = real(ep.parsepar());
     else if(ep.eat("distunit(")) distunit = real(ep.parsepar());
+    else if(ep.eat("line(")) {
+      addflag(arcm::sfLINE);
+      c.have_line = true;
+      }
+    else if(ep.eat("grave(")) {
+      addflag(arcm::sfPH);
+      c.have_ph = true;
+      }
     else if(ep.eat("let(")) {
       string tok = ep.next_token();
       ep.force_eat("=");
@@ -125,6 +143,7 @@ void load(const string& fname) {
       c.shapes.emplace_back();
       auto& cc = c.shapes.back();
       cc.id = isize(c.shapes) - 1;
+      cc.flags = 0;
       while(ep.next() != ')') {
         ld dist = ep.rparse(0);
         ep.force_eat(",");
@@ -370,6 +389,14 @@ EX bool in() { return geometry == gArbitrary; }
 
 EX string tes = "tessellations/marjorie-rice.tes";
 
+EX bool linespattern(cell *c) {
+  return current.shapes[id_of(c->master)].flags & arcm::sfLINE;
+  }
+
+EX bool pseudohept(cell *c) {
+  return current.shapes[id_of(c->master)].flags & arcm::sfPH;
+  }
+
 EX void choose() {
   dialog::openFileDialog(tes, XLAT("open a tiling"), ".tes", 
   [] () {
diff --git a/archimedean.cpp b/archimedean.cpp
index d8f70621..bec90c91 100644
--- a/archimedean.cpp
+++ b/archimedean.cpp
@@ -84,11 +84,13 @@ struct archimedean_tiling {
 
 #if CAP_ARCM
 
+#if HDR
 static const int sfPH = 1;
 static const int sfLINE = 2;
 static const int sfCHESS = 4;
 static const int sfTHREE = 8;
 static const int sfSEMILINE = 16;
+#endif
 
 EX archimedean_tiling current;
 
diff --git a/landgen.cpp b/landgen.cpp
index 0ff8bbfb..99730ec5 100644
--- a/landgen.cpp
+++ b/landgen.cpp
@@ -597,6 +597,8 @@ EX void giantLandSwitch(cell *c, int d, cell *from) {
         else if(arcm::in() && arcm::current.have_line)
           v = arcm::linespattern(c) ? 24 : 16;
         #endif
+        else if(arb::in() && arb::current.have_line)
+          v = arb::linespattern(c) ? 24 : 16;
         else if((euclid&&bounded) || hyperbolic_not37 || quotient || arcm::in()) {
           v = hrand(100) < 25 ? 24 : 16;
           }
@@ -663,6 +665,8 @@ EX void giantLandSwitch(cell *c, int d, cell *from) {
         else if(arcm::in() && arcm::current.have_line)
           c->wall = arcm::linespattern(c) ? waTrapdoor : waNone;
         #endif
+        else if(arb::in() && arb::current.have_line)
+          c->wall = arb::linespattern(c) ? waTrapdoor : waNone;
         else if(euclid && !arcm::in()) {
           auto co = euc2_coordinates(c);
           int y = co.second;
@@ -691,6 +695,8 @@ EX void giantLandSwitch(cell *c, int d, cell *from) {
         else if(arcm::in() && arcm::current.have_line)
           c->wall = arcm::linespattern(c) ? waVinePlant : waNone;
         #endif
+        else if(arb::in() && arb::current.have_line)
+          c->wall = arb::linespattern(c) ? waVinePlant : waNone;
         else if(nil) {
           if((c->master->emeraldval & 1) == 1)
             c->wall = waVinePlant;
diff --git a/pattern2.cpp b/pattern2.cpp
index 0d7c2e92..975aa5d1 100644
--- a/pattern2.cpp
+++ b/pattern2.cpp
@@ -1245,6 +1245,8 @@ EX int geosupport_football() {
   if(arcm::in() /* PURE */) return arcm::current.support_football();
 #endif
 
+  if(arb::in()) return arb::current.have_ph;
+
 #if CAP_IRR
   if(IRREGULAR) return irr::bitruncations_performed ? 2 : 1;
 #endif
@@ -1269,7 +1271,7 @@ EX int pattern_threecolor(cell *c) {
       return c->master->rval1;
     }
   #endif
-  if(arb::in()) return 0;
+  if(arb::in()) return arb::id_of(c->master) % 3;
   if(IRREGULAR || bt::in()) return !pseudohept(c);
   #if CAP_GP
   if(S3 == 3 && !(S7&1) && gp_threecolor() == 1 && c->master->c7 != c) {
@@ -1407,6 +1409,7 @@ EX bool pseudohept(cell *c) {
   #if CAP_ARCM
   if(arcm::in()) return arcm::pseudohept(c);
   #endif
+  if(arb::in()) return arb::pseudohept(c);
   #if CAP_GP
   if(GOLDBERG && gp_threecolor() == 2)
     return gp::pseudohept_val(c) == 0;