Digital design and computer architecture textbook, 2nd edition, lying open, worn cover, colorful diagrams, circuit boards, microprocessors, wires, chips, motherboards, CPU, ALU, registers, buses, memory, input/output devices, flip-flops, counters, adders, multiplexers, de-multiplexers, encoder, decoder, binary numbers, hexadecimal codes, flowcharts, algorithms, computer labs, desks, chairs, whiteboard, markers, professor, students, university, technology building, modern architecture, glass walls, steel frames, LED lights, soft focus, shallow depth of field, natural light.