Links:
[1] http://www.thinkfun.com/shop/product/aha-4-piece-pyramid,4,13.htm
[2] http://www.thinkfun.com/sites/default/files/images/product_library/aha_4piecepyramid/AHA4PiecPyr-Sell-1468.pdf
[3] http://www.thinkfun.com/sites/default/files/images/product_instructions_pdfs/AHA4PiecPyr-1468-IN02.pdf
[4] http://www.thinkfun.com/sites/default/files/images/product_library/aha_4piecepyramid/AHA4PiecePyr-1468-solution.pdf
[5] http://www.thinkfun.com/sites/default/files/images/product_library/aha_4piecepyramid/AHA4PiecPyr-1468-HiResSpill.jpg
[6] http://www.thinkfun.com/sites/default/files/images/product_library/aha_4piecepyramid/AHA4PiecPyr-1468-LoResSpill.jpg
[7] http://www.thinkfun.com/sites/default/files/images/product_library/aha_4piecepyramid/AHA4PiecPyr-1468-Isl-Logo.pdf
[8] http://www.thinkfun.com/sites/default/files/images/banners/aha4piecePyramid.jpg