Sound-absorbing materials, acoustic panels, echo-reducing walls, optimized classroom layout, teacher's podium, student desks, chairs, soft carpet flooring, minimal reverberation time, clear audio transmission, speech intelligibility, background noise reduction, soundproofing, double-glazed windows, absorptive ceiling tiles, diffuse reflection, 3D spatial audio, realistic sound simulation, warm natural lighting, comfortable seating arrangements, interactive whiteboards, educational decorations, calm atmosphere, panoramic view, shallow depth of field.