الكل 36 خداع بصري 4 لون 8 حركة 1 مخفي 8 هندسة 11 منظور 3 تفاعلي 1 هندسة The Café Wall Rows of black and white tiles, thin grey lines between them, and a question about which way those lines run. هندسة The Hidden Line A line runs behind a band and comes out the other side. Three lines come out; only one is it. هندسة Parallel Lines Six long slanting lines, crossed with short strokes, and a question about whether they run side by side. هندسة Bowed Lines Two red lines across a burst of rays. Are they straight? هندسة Ring Around Two dark discs, one in a tight ring and one in a wide one. هندسة Two Arches Two curved shapes, one above the other. One of them is bigger — or is it? هندسة The Tall T An upside-down T. Which of its two lines is longer? هندسة The Parallelogram Two red diagonals in two parallelograms, a big one and a small one. هندسة Filled Space Two stretches between three marks: one filled with ticks, one left empty. هندسة The Company It Keeps Two orange circles, two crowds around them, and one question about size. هندسة Equal Lines Two lines, a few fins, and a question that is easier to answer than it looks.